Find the webpage you want to make a link to and copy the full address (including http://).
Type the text you want to link into your blog post and then highlight it.
When it is highlighted, press the "link" button.
Paste (control-V or "paste" in the edit menu) the page address into the window that comes down.
Don't forget to click your link to make sure it works!
How to make a link using blogger
