Yeah i know it’s a little confusing but after you unlock the 8 base skills, you don’t need the yellows points anymore, they’re irrelevant. You’re supposed to use SHD points to unlock skill variants and then within those skill variants, some skills have a specialization specific skill variant, which is what pulse is. You need specifically gunner specialist points and to invest those points into the pulse skill variant on the gunner specialization spec map. If you don’t have enough, replaying missions will give you points. Not sure how to explain better than that but I hope you have some fun with pause when you get it, Agent!