I would like to check a frame designed from a channel section, which will be anchored to the wall with M12 bolts.
After going to the simulation, there is an error—I probably didn't do something right—I can't add forces or fixings.

Should I choose contact or bonded in global variables? I have read that bonded is used for welded structures, and contact for bolted structures, but I have both.

Will simply adding bolts to the connections be sufficient in the analysis? How do I indicate welds? To be able to say with a high degree of certainty how much the platform will withstand.