In the upper right corner of the screen, click on the "gear" icon to open the course settings.
On the resulting drop-down list, select the Turn editing on menu option.
In the section of your course where you would like to add the video link, click on the Add an activity or resource link.
In the left column, scroll down and select the Page radio button, then click on the Add button.
In the Name field, type a name for the video link. This is what the students will see on your Moodle page.
Scroll down to the Page content field and type TEMP
Click on the first icon in the Page content toolbar. This expands the toolbar, showing all options.
Once the toolbar has been expanded, click on the HTML toggle icon which is the last icon in the second row. This icon toggles between regular text and HTML text. You should now see the text you entered earlier, bracketed by <p>TEMP</p>. Highlight all of the existing HTML code and then paste in the Vimeo embed code. In other words, replace the existing HTML with the embed code.
Scroll down and click on the Save and return to course button.