if you have apps for meego installed then using terminal you can just do "apt-get install forum-tmo"

replace "tmo" with "fmc" for forum.meego.com reader...


Edit: Just to clarify; you most probably won't be able to find it in the A4M client itself due to a bug which has limited display of apps with an exclusion of apps with initials A to O...So installing via terminal is your best bet