How does one add a link to another page in the journal entries?

Racpat

Open up the page you wish to include as a link, and copy its address to the clipboard.  Note that you can also link to a specific photograph, by first clicking on the ‘link’ button beneath the photo before copying the address at the top.

Then, open the page you are editing in your own blog.  Position the cursor at the point where you wish to include the link, and click the link icon on the power bar.  Paste the address you copied earlier, and give it a description.

Old-timers like me can just type in the raw html and have it show up as a link.
We can do the same for bold and italic. This offers no real advantage over using the handy buttons, but it's good to know for those of us who are used to creating artisanal html.

The Internet seems new to me. Does that make me an extra-old-timer?  ;-)