Help with changes to a Wordpress site

I need to have some changes made to a "Mazine" Wordpress template website (www.habitatmonitor.com) as soon as possible. The site has been up and working for a year now.

The developer told me he'd make the changes but I haven't heard from him in weeks now and my client is really upset. Any chance we can talk in the next day or so?

I am not sure how long it will take, but I am hoping the first changes won't take more than a couple of hours. I am also hoping to have someone available on an on-going basis when issue arise.

Thanks!