Meatball-Hero

So I'm trying to add a send/return block so I can run a preamp into a cab block; but the native isn't letting me add the block.

The option to insert a send/return block is grayed out for me and won't let me access it...is there a specific reason? I'm trying to insert and outboard tube preamp into the chain to run it into a cab block

So I just got my Stomp and tried to install the Native. It doesn't show up in Studio One even though its says it was installed. There also aren't any files under the Line 6 folder that was put on my computer after the install.