You are in the starting cell block?
The tunnel in the centre left cell is a dead end (literally; Edmond died before he could complete it). You need to exit the tunnel and go around to the opposite side to enter the centre right cell, in order to find something to convince Edmond that he is dead.
To get out of the cell block, check out the south west corner cell (#8). In that tunnel there is no lever. Loot the corpse of the imp, and continue south and east
The Beyond Divinity forums still exist (
English), they just are not very active. In the main forum list they are above the Divine Divinity forums, which are above the Chat forums.