There is a seperate category 3rd Party where all projects using their own PCBs are in. The category is hidden for new users, because these are projects for advanced users. So after reaching the next trust level you will also have access to those topics.
Sometime the connection inside the breadbord don’t work well. You can use it for testing, but sometimes it causes errors.
But you can use something like this and solder the connections.
Or you solder all the connections yourself.
A picture also visible for new users is here
No matter what you decide, use pin headers for the player and the Nano, so you can remove them if you have to.