Can you post sheet music of your own arrangements pop on a website?

Yes, you can post sheet music of your own arrangements pop on a website, provided that you have the appropriate rights to do so. If you are the composer of the original music, then you own the copyright to the music and you have the right to post the sheet music of your own arrangements on a website. However, if you are not the composer of the original music, then you may need to obtain permission from the copyright holder before posting the sheet music of your own arrangements on a website.