Copy both stage and unstage to ~/bin/ and mkdir ~/stage. Configure the variable DOMAIN (the domain associated with your Uberspace) in ~/bin/stage and ~/bin/unstage.
stage <STAGENAME>createsstagename.yourdomain.tld(or rather the directory required for that) and a MySQL database namedusername_stagename. It also links the stage to your home dir, so you can access it through~/stage/stagename/.unstage <STAGENAME>removes stage, symlink and MySQL database.