How Do I add "Bookmark" this page

We just moved our website. I’ve set up a redirect to the new site, but I would like visitors to just click a “bookmark this page” button which would automatically send them to their bookmark or favorites menu to save the page.

My mind is blank and I can’t think of the code to do this.

Any help appreciated (or send me to a remedial site to learn how it is done)! Must be all the turkey these past few days.

Thanks,