Out of the Abyss Module Tokens

First, sorry fomy bad english, im french. I bought Out of the Abyss and I'm preparing my 1st session. In the page of Velkynelve , theres a lot of tokens. SOme can be used and others can't be. For example Asha, Shoor, Ivara, somes drow and Quaggot  in main hall can't but. Is there anyway I can use their token?

Hi Yannick,  On that particular map, those tokens are on the GM layer, since they are not always immediately perceived by the players. When your players get to that area, you can move them to the token layer by switching to the GM layer, selecting them, right-clicking and choose to send them to the token layer. Tokens that are described in the text as being hidden, that show up later in an encounter, are situational or optional are always placed on the GM layer. You can tell because they will have a slightly transparent look to them, depending on the opacity settings in your layer toolbar.

Ok I didnt know about different layer, thank you. I found where I can switch  in the toolbar.