I would like to be able to enter a name into a TextBox press enter and have the character load.
I have very basic scripting knowledge and have searched YouTube, and the forums here.
For example, @Konethorix has already achieved what I want with their most popular game being jojo poses simulator.
I already have a quite simple UI setup:

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I assume you are trying to get the model of a player given their name? If so use GetCharacterAppearanceAsync which gives you a model of the character when you provide a UserID. Now in your case you will also need to use GetUserIdFromNameAsync so you can take the username and get their UserID. Both of these make webcalls to Roblox so ensure you have these functions wrapped in pcalls to avoid issues with your scripts if the requests fail.