I am pretty certain you already have some trait-points, but maybe you need a little hint to find them.
The two main sources for trait points are plain levelling and doing class deeds. By just levelling your character, you will earn a trait point every odd level, starting at level 7. Class deeds are organized in groups of 3 nowaddays and finishing all class deeds in a given group will also give you a trait point. At level 76, you should have thirty-something trait points, I think.
Now, open your traits panel. You will see three options, usually identified by their colours - red, blue and yellow. Read the descriptions and choose the one that seems to fit your playstyle best. By choosing a trait tree to specialise in, you will also get immediate access to a few skills (which are listed on that first page) and you can also see which bonus traits you will unlock by spending trait points. The stuff that is tied to the individual trait trees CANNOT be unlocked in any other way. A Lore-Master who wants access to Test of Will HAS to choose the yellow trait tree and a Hunter who wants to be able to use induction skills on the move HAS to choose the blue trait tree.
Once you have decided on a trait tree and clicked the button beneath that tree, you will be taken to a new page which shows the actual skills you can invest trait points into. Towards the lower left-hand corner, this page also tells you how many trait points you have available and how many you have spent already. You can begin to invest your points at the top of your three trait trees. Every five points you invest anywhere in a given tree, a new tier of skills in that tree will become available to you. For every five points spent in your active tree, you will also earn a bonus trait, which you can see on the left side of th panel (depending on your account status, you may have to unlock these trait slots in the Store first before the bonus trait becomes active). Any skill in your active tree costs 1 trait point; any skill in the other two trees costs 2 trait points.
German, female, migrated from CodeMasters in 2011, Premium member, slow-leveller, pure PvEer and opposed to Forced Emotes - wherever I fit into the statistic, it's not in its middle.