Can someone explain me, what I have to do on which wallet cold/remote to vote with a single MN?
2 possibilities:
- Open the wallet which holds the 1000 DASH, open the debug console there and type "masternode vote yea" (or masternode vote nay)
- Go to the computer which is running your Masternode daemon itself (most probably at some hosting service), open a shell and type "dashd masternode vote yea" (or nay)
(of course don't type the quotes)
This is the most general case. In cases where you customized your setup (e.g. to a different path than the default Dash-folder) you will have to ask more specific questions here.