Hi Ultima. Your Otakoins should be visible in a box just underneath the box that contains your post, group, member #, etc. on the left-hand side beneath your avatar.
This box will contain "Otakoins, Donate, and Otakuness" (otakuness is your reputation). If it helps, I am able to see how many Otakoins you have!
Check again and please let me know if you are still unable to find it.