1990 Toyota Celica GT-how to replace rear turn signal?

[lucky]

I just realized that my rear turn signal bulb is not working. I noticed this when I turned on my left turn signal and the arrow light on my dashboard, as well as the signal noise, went faster than normal.
I bought a replacement rear turn signal bulb but there's a problem.
How do I remove the plastic covering in order to get to the bulb to replace it? There's only one screw which I removed but no other discernible way to remove the plastic covering. Removing the screw did nothing. Please help!
Thank you.

[integr8]

Get a manual. Chiltons makes manuals for alot of Toyotas.

[beckgts]

first pull off the rear carpet lining.there are 2 white plastic clips that u have 2 hit w/ a hammer. then take the one screw out that u found be4. use a flat blade 2 remove the side marker light. it is part of the tail light.there are 2 screws und er that peice. once u do that it should fall right out. if u still have problems e-mail me @ [email protected]