Changing Base Directory?

[Inked_Mono]

Quick question!

I've had this issue before, but for the life of me can't remember the fix. Right now, I'm hosting User Ranks on my host, so the directory to the image reads as "/images/whatever/whatever.png". However, when the forum goes to seek those images, it's not adding the original "/forum" prefix, and I'm unable to add it to the User Rank image directory as it tells me it's an invalid path specified.

How do I fix this?

User Rank Settings (not the lack of "/forum" on file path): http://i.imgur.com/kGwqmDh.png
Where it's connecting to: http://i.imgur.com/1OrvZYf.png
When I try and add "/forum" to User Rank file path: http://i.imgur.com/SQ4xk7B.png