Adding a hashtag to the OK.RU repost?

Question

Classmates

Good day.
Tell me, if anyone knows how to add a hashtag to the repost for the ok.ru website.
More: There is a promo site from which you need to repost to the ok.ru social network, but you can’t find information on how to put a hashtag in the repost text. I tried to add "#hashtag" to the repost link, but this thing does not get into the repost itself and is deleted.
Or maybe someone knows how to search for records on the ok.ru site by text? You can do this in vk and facebook, but I didn’t find such a function on classmates.