Mike,
If you mean the Super TL 1000, this was my first SLR. see http://www.praktica-users.com/cams/l/supertl1000.html for a manual.

You actually depress the depth of field preview button (big rectangular black one just next to the shutter release) to enable the meter.

This camera served me well, the only complaint I had about it is that the viewfinder's image was rather dim even when you weren't stopping down to meter the scene.

regards
Peter