How to implement tinymce text editor on ASP.NET core 6

Go back to where you got the text editor source from, and ask there: we don't have any idea what package you are using, or how you are using it, much less how you were supposed to use it!
They at least will know their product much better that we will, and should be able to provide you with a better answer.

For example, if you got the code from an article on this site, there is a forum at the bottom of that article which lets you speak directly to the author. Other sites will have similar mechanisms.

But when you ask there, remember that nobody can see your screen, access your HDD, or read your mind - we only get exactly what you type to work with - nobody gets any other context for your project. We can't see your code; we have no idea what you did!

Imagine this: you go for a drive in the country, but you have a problem with the car. You call the garage, say "it broke" and turn off your phone. How long will you be waiting before the garage arrives with the right bits and tools to fix the car given they don't know what make or model it is, who you are, what happened when it all went wrong, or even where you are?

And that's what you've done here. So stop typing as little as possible and try explaining things to people who have no way to access your project!