Shower Door Track Guide Please Help. Sliding Shower Door Guide At The Bottom Wont Stay Put.?

Please Help. Sliding Shower door Guide at the bottom wont stay put.? - shower door track guide

I have a new shower door. And the basic theme is only about four inches long. (More information as a guide.) Is made of flexible plastic and is expected to go into the break, still not in. But keep in the block of wood with a hammer, but it did not work. I would try to tail, but he was advised against it. Please help. Thank you in advance.