hi, i got given the above and took nature as the extra proficiency. I clicked on the customise option and changed it to proficient. it now shows a blue dot (rest are black) and doesn't show my prof bonus next to the skill or even the stat bonus of 1. it should give me a skill of 3, do i have to manually add the numbers ? just assumed it would do it automatically.

                                                                                                                                                                                                                                                                           thanks, dead

I don't think you're talking about something unique to the primal knowledge.  I have the blue dot on one of my sheets and it's a straight multi class build with no feats or optional class features.  I have to pay attention to it manually whenever proficiency bonus jumps.  I've never reported it but informally I've been told by other users that the blue dot happens sometimes.

I'm guessing you used the customization option on the character sheet, rather than in the builder? Using the builder to do it properly is probably easier.

First off, is your character a level 3 or higher barbarian? If not, Primal Knowledge isn't available yet - you only get that benefit at lvl 3, and again at lvl 10. If that's not an issue, try the following steps:
Primal Knowledge is an optional feature, so first of all you need to enable those (on the first, "Home", page of the builder, switch the button next to Optional Class Features to red). Then o-when you get to the Class page, click on Optional Feature Manager to bring that to the front and check Primal Knowledge. If you then click on Class Features to bring that back up again, you'll get the option to choose your Primal Knowledge proficiency once you hit level 3.  

hi, i am 3rd lvl with  Optional Class Features enabled, but when i click on class and Optional Feature Manager, it says You currently have no available optional class features for this class, im very confused lol. just looked at my rouge and i cant add the optional steady aim to him either lol beyond hates me.:-)

                                   thanks  dead

thanks for help all, its because i dont own tashas or xanathars books, what an idiot lol.

I cannot select Stealth for my primal knowledge. Is this a bug or rule change?