Can I change the menus on the default browser? I have an Evo running Froyo and love it. 

But...

In the default browser (which I am happy with)  the menu options are Back, Forward, Add Bookmarks, Bookmarks, Windows and More. Thing is, I share links with the cloud (Twitter, Facebook, Reader, Dropbox, etc.) much more than adding bookmarks. I use Chrome so that all my bookmarks are shared between all my computers, so on, phone bookmarks are where ideas go to die. How can I move Add Bookmarks to More and bring Share forward?
No - as far as I can tell you can't change the menu in an application (unless that application specifically has that feature).  You could try downloading another browser like Opera, Firefox 4, or Dolphin (just to name a few).

That being said, if you still want to use the default browser, you can "long-press" on the address bar and a context menu will pop up with the option to "Share page". You can use that instead.

Hope this helps.