How to get the green lights burning on your WordPress site? Buy a COMODO SSL cerificate, it will set you back € 10,- a year, but then the url becomes green indeed for extra trust on your site at nearly no cost. If your provider (like hostingdiscounter in the Netherlands) has a SSL-offering they probably install it for you fully automated. You will get an email asking if you are who you say you are, after you confirm the certificate is issued.
Be warned, this cheap certificate is only meant for plain sites, not for handling large amounts and certainly not for financial transactions ..