I feel your pain! I am a professional web developer and, even after having used WikiTree for a year, I still often have a great deal of difficulty finding the things I'm looking for in what I call "the Help Labyrinth".
If you click Help in the menu at top right of every WikiTree page, then click Help Topics, you'll see an alphabetical index to the topics. You can then select the topic you think seems most likely to have the information you need, but way too often, it turns out to not be the right place to look. The Help pages here are EXTREMELY extensive, but just as extremely difficult to navigate. I offered to organize the help pages in a more user friendly way, but my offer was never acknowledged, let alone accepted.
To answer your immediate question, it will be easier for me to type the instructions here than to find the help page where they are:
WikiTree uses something called "wikicode" which sometimes looks similar to HTML, but is not at all the same. To put a URL on a WikiTree page, you use the following:
[URL Link Text]
The code starts and ends with a single square bracket. Inside the brackts, you start with the URL, then type a space, followed by whatever you want to appear as the "hot text". Note that once the URL is ended by typing a space, you can put spaces or anything else after it and they will all be part of the link that is displayed until you end it with the right square bracket.
Please always feel free to ask anything here in G2G - there are lots and lots of people falling all over themselves trying to help folks.
EDITED - For an example of a link to your blog:
Please see my [http://www.myblog.com blog] for more information.
This would display as:
Please see my blog for more information.