why i can't use my adobe flash in my virtual lesson on online studies

Also, to give you any useful advice, I'm going to need to know more about your computer and browser:

https://forums.adobe.com/thread/1195540

Additionally, the major browser vendors disable Flash by default, in a per-site basis, and as of Chrome 69, Flash settings are only stored until the browser is closed/exited. These are browser vendor decisions, nothing to do with Adobe and Flash Player.

For information on enabling Flash in the various browsers, see Flash Player Help

Please check you are on a compatible system (Mac or Windows). If you are, please tell us your system, your browser, and the exact message or problem you see.

Moving this to Using Flash Player