Hi everyone,In the TV show" How I Met Your Mother"Ted share an apartment with his friends Marshall and Lilly. Marshall and his fiancee Lilly tried to edge Ted out by taking down his favorite sword that he'd hung up on the wall but Ted confronted them and didn't allow them do so. Ted's friend Barney gives him some advises.Barney: Look, you held off their first advance. That's good. Now, it's time to counterstrike.Ted: What am I supposed to do?Barney: You gotta mark your territory. And I don't mean missing the toilet.What's the meaning of "what am I supposed to do"?
Does it mean" what do you think/suppose I should do"?