Unsure how to fix our website

Hello,

After some digging on our site i see the marketing team used this site to create our website. Our marketing team no longer works for us and we have no information on logins or where to fix our site and are at a bit of a loss on how to proceed. If you go to our website it just appears as text no pictures, the pages arent functioning properly and it is quite slow to do anything. Our current thought is either to find someone who can help us fix it and or have someone else create a new website please let me know any info that can steer us in the right direction

The page I need help with: [log in to see the link]