Facebook & Google AdWords retargeting is available to Bitrix24 commercial plan subscribers only.
To start a new retargeting in Ads Network go to CRM Marketing > Ads & click on Create Ad tab:
For Facebook retargeting please select recipient segment & configure target audience - click Connect. Here you will need to connect your Facebook Ads account (if you don't have one please create a new Facebook Ads account first).
After your Facebook Ads account is connected please select corresponding audience (if you don't have any to select from please create a new audience in your Facebook Ads account first). Save.
Same for Google AdWords retargeting - please select recipient segment & configure target audience - click Connect.
All saved ads can be found at CRM Marketing > Ads page.