how to modify paypal landing page

hi there

i have multiple domains all in the same directory on my 1and1 hosting, the first of which is stegnome.com (i use this for ebay not my store), but i've added my opencart store under a subdirectory called gnoamee.com. that all works fine, but when my customer lands on paypal, it says stegnome and also 'cancel and return to stegnome' - i need this to say 'gnoamee' instead (and other names for when i set up more stores).

anyone got any idea?

thanks in advance - so far i've struggled through teaching myself everything, so this is my first post appealing for help!

http://www.gnoamee.com/shop