Well I got it all wrong then.. so "Cancel (double-spend)"-increase fee and "OK" and that's it? What happens if I don't do that? It takes weeks / months to transfer?
It could be, but weeks is too long, btc transaction fee recommendations just from 2-6 sat/vb, last few days it just 2 sat/vb. Say your transaction fee is only 1 sat/vb then a week is long enough for that to confirm, i guess 3 days could be sufficient to go through.