Select the word or words you would like to link to another part on that page. Right click and select Insert Link…
You will need to have the Advanced section showing, so click on the Advanced button and it will open.
In the HREF: box type a # symbol and then a word to anchor your link to (no spaces in here and it can not be the same as another anchor link)
Then hit OK.
Then scroll down on the page where you would like the anchor to go and put your cursor there. Go up to Insert and select Section Anchor. 
Type in the same exact word you used for the HREF box (do NOT put the # symbol in)
Then hit OK.
That’s it, click Publish and it will be live on your site.