Table is marked as crashed and should be repaired

I am getting this error in [WordPress][1]' phpMyAdmin: #145 - Table './DB_NAME/wp_posts' is marked as crashed and should be repaired When I login to phpMyAdmin, it says `wp_posts` is "in use" My website is currently down because of this. I googled this problem, but I don't see the "repair" button on phpMyAdmin. Please let me know how to fix this. I am not sure where to issue a PHP command. Please advise, my proficiency with PHP is very basic. [1]: https://wordpress.com/en/