WordPress plugins wont install

WWhen I try installing a plugin it either says “Fatal error: Maximum execution time of 10 seconds exceeded in /home/a7380480/public_html/wp-admin/includes/class-wp-filesystem-direct.php on line 172”

or it either says “Unpacking the package” and dosent do anything.

How can I fix this.
My website is http://africanfest.comuv.com/

Thanks,
Suyuper