Installed wpmu dashboard. Now, can't even log into blog.

I’ve just signed up for a payed account. Installed the dashboard following your instruction.

After this, the only this happening is that I get this error message:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 30720 bytes) in /storage/content/20/165120/mediaministeriet.se/public_html/blogg/wp-admin/menu.php on line 43

It so bad I can’t even get to the WP login without error. Right now I’m stumped, blocked and a bit frustrated (to be quite honest).

Help and assistance, please!

Regards

Mats Hultgren