I'm trying to make a race that can wild shape into a Homebrew creature that I made, but that Homebrew creature will not show up when I tried to add it as a racial trait. I know it's not something that I just have to wait till it shows up because I made the creature nearly 24 hours ago but it will not show up. 

Yeah, no. I’m sorry to be the one to tell but that’s just something we can’t do. They don’t want us attaching Homebrew monsters to races because it can cause problems if you ever publish the race but not the monster. You can however still include the monster statblock in your racial trait at least by means of a copy/paste. If it helps please check out the Homebrew Subclasses & Species FAQ #10: (https://www.dndbeyond.com/forums/dungeons-dragons-discussion/homebrew-house-rules/131411-a-homebrewers-how-to-faq#HomebrewSubclasses&SpeciesFAQ).