How do I interact with two older wts posts from same user?

Am keen to buy two flashlights from the same user but cannot message them as a new user or reply to their older posts. It says they were seen an hour ago… paging @Geuzzz

It’s nice to see you, ncham!
According to Mr. Admin (a.k.a. sb56637):
“Hi there, as a new user your account has private message limitations. Please continue to use BLF, and the limits will eventually be lifted.”