It wont allow me to access due to low memory???

I’m trying to re-access this plugin after pausing and removing from the menu and when I accessed it, it shows:

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 130968 bytes) in /home/fnoces/iqamacheck.com/wp-includes/plugin.php on line 4323

I have 10,136 to moderate… I don’t even know what these are..

Kindly advise.