I want to add my subdomain for my Wordpress blog, and i can't install phpmyadmin, so... I think that multisites could be an alternative, but i can't modify MySQL database because MySQL was installed when i bought the ...

I want to install two CMS in the same droplet, i use Ubuntu 14.10 and Fedora Workstation (last version)... Thanks ...

I want to buy an droplet but my question is "The storage is updated every mont?" Example The 30Gb of SSD storage are refreshed every month OR the 30gb are set?