I find it rather difficult to find some of my older posts I made. Is there a place where I can see all the posts I made on this site?

At the moment don't have this functionality, we note it for future updates.

NO,I cant

If I need to dredge up an old post, I search my username in the Google
Search box at the bottom of the forum. It's not very convenient but with a little poking around you can find your post. I hope.