be welcome to (something)
To be expressly or freely permitted to have, use, or do something. You're welcome to the spare bed if you want to spend the night here. They're welcome to change the color if they are that unhappy with it.
welcome to, be
Be cordially or freely allowed to, as in You're most welcome to join us, or You're welcome to borrow my boat whenever you like. [1300s] Also see you're welcome.