Hello, totally new here, Reddit immigrant.

Hopefully this is an appropriate place to ask this.....

Have signed up (obviously!) and currently building up my subscriptions via the web interface, all is good.

I went looking for an android client and settled on Tusky, based on users and reviews. However I cant seem to sign in to this account with it - the login prompt is "which instance?" and I have tried various forms using my username and not (so feddit.uk, @feddit.uk, urbanmoth@feddit.uk, !urbanmoth@feddit.uk, @urbanmoth:feddit.uk) none of them work.

Can I not use this client with feddit.uk? or am I doing something totally stupid (which has been known!)