Add header widget to existing wordpress template

Immediate start !!! We have a site in development and need a minor addition to the header area. Need to have a phone number (clickable on smartphone), email address & contact us link in the right side of header area. This needs to be able to be updated later if required therefore widget or similar is appropriate & needs to work in smartphone/ Theme used is CatchEverest which has a header area. Test site is [login to view URL] Details to add are: Contact Us (linked to contact page, slightly larger maybe bold) Phone: 1300 551 926 Email address link (unable to be placed here)