To become a Chartered member of BCS you need to be awarded CITP, CEng or CSci by BCS
Everything you need to know about applying for Chartered status can be found at http://www.bcs.org/category/10966
There are also a number of online tools so that you can check your eligibility and when you are ready to apply just log in to the Secure area.
Your subscription for Chartered status will only become due at your next renewal, although a one-off application fee is required when you apply.
If you need any additional support with your application please contact us at www.bcs.org/livechat or by email: firstname.lastname@example.org