Bookmarklets are just bookmarks containing small Javascript programs instead of links to other websites.
Running a bookmarklet while on a website will modify the page you are currently on.
Drag the links into your bookmarks bar to begin using them as bookmarklets.
Bookmarks consist of a name and URL. You can change both of these by right-clicking the bookmark and selecting edit.
Find or create a bookmark to modify. "Copy link address" from one of the links below, paste it into the URL section, then add a name. Be sure to select a short, easy-to-search name.
Type the name of the bookmarklet in the search bar, Chrome will give you suggestions based on what you type. Click the bookmarklet once you see it.
Add the bookmarklets to Chrome on your desktop computer. Turn sync on within both browsers. Now the bookmarks will sync to your phone.
Long-click the link on this page and select "Copy Link Address." Touch the three dots in the upper right-hand corner of mobile Chrome. Touch the star to bookmark this page. Edit the bookmark's name, URL, and location. Delete the URL, paste the copied link address in the URL field and change the name field. Be sure to select a short, easy-to-search name.