You can easily link to headings on the same page. 

1. Make sure the section you want to link on the same page have an H2 headline

2. Select a text, then click on the link icon to search for an H2 headline name

If you need to link a section/anchor to another page, simply get the anchor link from the page you would like to link to.  Once you have the link you can highlight the text you want to link, click on the link icon and paste the anchor link to the page.