I've just created my account on Seo chat forum and came across your issue I think I can help you out, as I have already submitted my site on blekko, below process may help you a lot.
once registered, login then??(give a name of your slashtag) [any name ur wish] after that create your own url.(search for website to add your slashtag)
type your websites URL into the section entitled List websites and slashtags:
lastly, click the Create Listing button.