View or search your contacts

Click the contact list name or click Search in the Actions button

This will open the contact list preview and search page

Click the Add Rule button to search your contacts attributes, for a more in depth explanation on Search Rules see segmenting

Click the + sign to add additional search criteria

Tag contacts by entering the tag name, selecting the contacts, and clicking "Add Tags"

Remove tags from contacts by selecting "Remove Tags" from the multi-function button drop down