Well, first of all you need to fill out the parameter box otherwise you are telling CPV Lab to append something after nothing at all.

The format is as so.... cpvlablink?parameter=append¶meter=append
Obviously this doesn't work... cpvlablink?=append&=append
You have to fill in the parameter:

You can name it as you want, but use the same in the URL Append (see green arrows)
The value of the parameters (token) you need to get from your traffic source (see red arrows)
And when you create the campaign, add the additional tokens, and your link should look like this:

Hope this help!
i love those arrows
Haha pro arrows for sure. Thanks qureyoon!
Thank you for the post.