how to go back through posts history ....

[gtfpv]

i've noticed soom post topics come up dated 3 months ago . if i go through the FPV section for example it says 304 posts . but then when i go through the 3 pages available the 1st post was 3 days ago . so how can i go through old posts . besides going through my user history .
2ndly now when i log onto the forums i have to put my user name and pass word in evertime . the computor used to remember these for me but not any more . any advise would be helpfull . as i am an L plate computor user.