Custom headings in Members List

[Becca]

Ok, i assume this question is asked loads, but unfortunately search results came back very vague and i couldn't figure out which terms to use.

Basically, i wish to edit my members list so that you can organise members by custom values which will be read from the database. The members list headings will end up looking something like:

Username : Join date : Posts : Last Visit : Score : Avatar

So i wish to insert the Score heading getting the data from the database. How would this be done?

Thanks.