Redirect to New interface

I have one login form, I want to add one link from where i can redirect user to next interface or register page if not register, can i do that using interface component . I was trying to do that but not able to give the uri for next interface, please check below code:

a!linkField(
/*label: "New User? Register Here!",*/
labelPosition: "ABOVE",
links: {
a!safeLink(
label: "New User? Register Here!",
uri:" ",
openLinkIn : "NEW_TAB"
)
}