You have the option to offer Free Trials for any subscription (and for any amount of time). Just click the "Settings" gear, and click the tab in the top right that says "Promotion". Then click the "+" black circle in the bottom right and select "Free Trial" under the section "Promo Type". You can customize the Free Trial however you want.
1. Click the "Settings" gear
2. Click "Promotion" in the top right
3. Click the "+"
4. Select "Free Trial" under Promo Type
5. Customize however you want (leave "Voucher Available" or "Date Range" blank to make it unlimited)
