If you are a registered user for any wiki on this site, then, you should be able to access somewhat extensive help write-up at another wiki on this site. You should be able to read that page (let me know, if you can't). With the substitution of "Momo" with "Group", all information there is applicable within any wiki on this site, as well. If you follow the above link, you do not note the links below, as they are included in the write-up linked above.
Otherwise, follow the links below for more generic help.
Physics 5B UCSC