can I manually force my character to update on the forum?

The character tab on my forum settings is stuck with info from before 2.4.

I have since leveled a Rogue/Ninja to 37, but I dont have the option to select that class. Still showing me as a Gladiator, but I havent played as one since 2.4 released.

Any way to force an update so I can select the correct information?

As far as I'm aware, you can't as SE hasn't updated the forum to include ROG/NIN in that dropdown menu sadly. Hopefully they will fix this problem soon though as I imagine it will be catching a lot of players out.