You can donate through here, but if you want account perks please go here.
Invision Power Services currently hosts the forums at a monthly rate of $330 (or $3,960 per year). All donations you contribute are put toward those and any necessary forum-related costs. On behalf of the community, we thank you for your support!
(Please note that this donation module is currently buggy, which is why we haven't been able to update the donations made vs. the donation goal for awhile. We hope to fix it as soon as we can!)