Subscribing to Socialinsider is easy:
Click the orange bar you see at the top of each page during the trial or when the trial is over.
Choose your preferred plan and the billing period, monthly or yearly, then click subscribe
In the next popup, enter your details - name, company, card (paypal and other methods are also available) then click Pay.
That's it, enjoy!
We use Fastspring as a payment and subscription processor. They're really great and friendly.