How to summon mount

[Boondoggle]

I've been away from WoW for two years and finally felt the call to reactivate my account.
I reinstalled a clean Realui with no other addons.
For the life of me I can't find or remenber where/how to summon a mount.
I know I've got dozens of them somewhere but all my random keypressing and googling has failed to produce a result.
I can't see a pet tab on the character screen nor anywhere else.
I'm not sure whether it's the UI hiding it or just my stupid brain forgetting the WoW keys.

Any help appreciated.