how to swap ''register link'' to ''log-out link'' when customer have logged

[masvv]

at the top of my store there is ''create an account'' link as you guys can see below:

 

 

once the user is logged in, it still shows the ''create an account'' link, I would like once the user is logged in the log-out link to be showed, cause atm there is no log-out option in my store.

 

ty all