Fixing facebook sharing image

My site is avelim.co.il. The site is on Hebrew wordpress 3.5.1, using the theme Weaver II Pro 1.3.2.1 The site has 127 active plugins. My test site is [login to view URL] What I want - when a post is shared on facebook I want a certain image to appear as a thumbnail in Facebook. I want to be able to set the image, and change it if I want. I tried to achiebve this using the theme options and using 2 plugins: [login to view URL] [login to view URL] In all 3 cases, when you share a post, you get to chose between 2 images - a candle (which is what I wanted), and the header image of the site. I don't want 2 options. I just want to have the image I selected, You can share a post and see: [login to view URL] Freelancer should explain how he intends to solve the issue in his bid. Work should stand theme upgrades and wordpress upgrades. Work should be done in 24 hours after being awarded the project. Freelancer should allow 7 days for testing after he finishes his work, before getting paid