Hi, i don't know if u will understand what i want to say, because google seems like it is not getting it. 

So, i want a mod or a commad which will make the name of the place appear when u enter it. Let's say i will make a "Dreaming forest" in the chunk X i want the name "Dreaming forest" to appear on the screen for 1-2 seconds when u enter the chunk X

What you want to do is make a GUI/Overlay. There's a million tutorials for that even if you're not going to look at the forge src docs

 

Now you'll want Forge to look for World.getBiome with a position. you'll want to take player.getPos for this. 

 

Then, whenever your previous World.getBiome is different from your current one, make your Gui Element appear with the correct name. That part should be as simple as a few if statements.

thanks a lot

No problem brochacho. Feel free to post more if you're running into trouble. don't forget the documentation at https://mcforge.readthedocs.io/en/latest/gettingstarted/ which covers a LOT of usefull stuff.