Guys im new divloper and i dont know how to use blender 2.91.0 can some one help me

i dont know how to change from render mode to blender game mode

From release of Blender 2.80 internal Game Engine was delete. You need use older 2.7x Blender version

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so i cant make games in blender 2.91.0

You cannot with only Blender, you need use one external game engine. In Blender you can build any assets for one game but Blender not more manage logic to have realtime interaction and not save assets and logic as executable game. You forgot to read Release note of Blender

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