Ensure there no items 'in the way' on the wall/floor e.g. stacks of paper, hose pipe etc.
Keep it away from blocking the doorway(s).
Some click & drag. Once you clicked on Basic telepad to place, it should appear in the edit box. Click & hold it while moving your character to the tp room then place it. Make sure it's facing the right way to ensure access to it once placed.
If you still have problems, post here & i'll have muck about & let you know click for click what I did. 
"Like War_Hero said, leave it as it is, it toughens up the softies." - Naz Nomad
Union Heroes
War Borg - Leader of The Paragon Knights
Union Villains
McCabe - Co-leader of The Rogue Knights
Defiant - Supreme Hero
The obvious: if the rooms floor/roof dont allow the placement, or if theres a small deco item blocking it
Im not sure if you need at least one beacon unlocked before you can place the teleporter though. (TP beacons are unlocked by collecting exploration badges of a hazard zone while in SG mode)
Also Basic Telepads (like all base items) have multiple requirements to place. These are
15,000 Prestige
50 Energy
25 Control
Also remember that a Basic Telepad is no good without a Beacon or two. Each beacon will cost you 10,000 Prestige and 5 Control.
Yeah, you wont be able to place it if your SG doesn't have enough PR. If you are short on energy or contol you can place it but it wont work.
I really should do something about this signature.
thx :P I did not notice it cost prestige -_-
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Also Basic Telepads (like all base items) have multiple requirements to place. These are
15,000 Prestige
50 Energy
25 Control
Also remember that a Basic Telepad is no good without a Beacon or two. Each beacon will cost you 10,000 Prestige and 5 Control.
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You can place telepads like other items even if you don't meet the control/energy requirements, however. They will just not function.
But good thing the problem was solved 
totally non-related matter:
does any1 know what would be required to get advanced(?) telepads?
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does any1 know what would be required to get advanced(?) telepads?
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For them to be added by the devs? 
I would guess that the only thing they could really do with Telepads is to allow more beacons to be attached to them.
Well this is gonna make me sound like an idiot but how do i make the damn thing work lol. u have 5 beacons and 2 are attacked to the telepad, i have enough energy and control but it wont do anything, does anyone else thing a teleporter should erm... teleport people?
I know the tech teleporter is a little difficult to trigger, if you move the view round so you are facing down at the panel the blue hand should appear click on it and then the menu showing where to teleport to should appear.
Assuming you have control power and beacons this is the only other thing I can think of.
lol akward barstuards cheers m8
I'm new to base editing and I've just gotten up a Teleport Chamber room
so I went to my workshop made a basic telepad then went, back to main room and hit Add Personal Item, once I went In Teleport Chamber it would not let me place my Basic Telepad -_-, am I doing something wrong?