Sorry for the delay in response.
Are you talking about when the song is starting?
The practice tracks count 1, 2, 3, 4 twice before the rhythm comes in.
You’d play the pickup on the second 2, 3 and 4.
So listen for 1, 2, 3, 4, 1 and then start playing the pickup notes.
If you’re still having trouble can you post a video? It’d be easier to help after hearing you play it to see what’s happening.