How to make functional character in roblox ??

I already did today a topic about “how to create own game character” but no one respond to me in posts, so I don’t need to know how to make joints but I need to know how to make the character R15 (with default roblox animation) functional that you can play like a regular character, here’s the image what’s happening when i hit play

R15 animation don’t work at first but after i reset it works