I’ve been working on this model for a while and finally started to rig him, but I probably pressed some kind of hotkey because I suddenly can’t use the Pose Edit anymore since every time I try to select the bones, it goes to the object instead.
Your Armature is in “Object Mode” (Menu option on the bottom of the Screen…) LMB-Click on the box with “Object Mode” in it and select “Pose Mode” - then you can pose the armature. CTRL+TAB switches Pose Mode/Object Mode, maybe that is what you did.