Hi!
To create an URL field you just need to enable URL validation. Click on the Validation link and check URL in the validation form.

Done! Now go and add the link, URL will be validated and on your Records page it will appear as a link.
Please, notice, that if your link points to an image it will be automatically rendered and shown inside your table.
Also for the url field you can use the following options:
- URL text;
- URL target (blank, self, parent, top);
- If URL you have added to the field points to an image, you can choose how it should look like: custom url text or image.
You can show URL without a title. Just leave the URL text field blank. See the screenshot:
Hope it helps!