From b2evolution manual

Version 3.3.1

This renderer automatically creates links for you.

• URLs can be made clickable automatically.
• Specific and frequently used terms can be configured to be automatically linked to a definition URL.

[edit] Configuration options

[edit] Autolink URLs

Check this to have URLs automatically made clickable. The plugin will detect URLs starting with http: https: mailto: aim: and icq:

The plugin will also detect web addresses staring with www. as well as email addresses containing an @.

This will save you time when mentioning URLs you want to link to.

[edit] Autolink defintions

Select the definition files you want to use. It is recommended that you add your own definitions to definitions.local.txt in order to make sure your custom defintions never get overwritten in an upgrade process.

See the file definitions.default.txt in the /plugins/autolinks_plugin/ folder for details about the file format. You can create definitions for one specific word or for groups of two words. (In case you wonder, the file format takes a word approach in order to optimize for rendering performance with large files and large posts.)

This will save you time with the URLs you frequently link to for reference. Although we're not necessarily recommending the use of Wikipedia, this is where many pro bloggers would want to enter their industry specific terms and their Wikipedia links.