Shared server no longer appears in Time Machine destination list
I used Time Machine to back up my Mac Book Pro on a NAS.
I mistakenly designated this server as a destination I did not want to use anymore, in Time Machine preference.
How could I start using that same server again for Time machine, i.e how can I get Time Machine to scan the network again and propose that server ?
MacBook Pro with Retina display, OS X El Capitan (10.11.3)