The information described below will cover a basic setup of SharePoint Foundation 2013 on your Exchange 2013 account.

The installation and configuration of SharePoint is a multi-step process consisting of:

Step 1. SharePoint Installation

To install SharePoint Foundation 2013, log into CONTROL PANEL and navigate to Services > SharePoint. Specify the amount of Disk Space you would like to use for the site; SharePoint owner (the administrative user who has full permissions to access the site by default), site name and site description. After clicking Install SharePoint, you can modify the following options:

Refer to the following article for instructions:
How do I change the owner of my hosted SharePoint site?
SharePoint 2013 disk space usage

Step 2. SharePoint Configuration

After SharePoint is installed you can log into the site using the SharePoint owner's email address and password. The site will prompt you to choose a template. You can preview the templates in MS Office Knowledge Base article.

Step 3. Adding users to SharePoint site

For users to access the site you need to add them both to CONTROL PANEL and to the site itself. Refer to the following articles for instructions:

How do I create users for the SharePoint 2013 site associated with my Exchange account?
How do I let people outside Smarsh Hosted Services account access my SharePoint 2013 site?

Step 4. Enabling Anonymous access

Anonymous access is not enabled by default for SharePoint 2013 sites. To enable anonymous access read the Knowledge Base article on How do I set up access to a SharePoint 2013 sub-site for anonymous users?

Step 5. Advanced SharePoint configuration

There are a lot of ways you can use the SharePoint Foundation 2013 to quickly create many types of sites where you can collaborate on Web pages, documents, lists, calendars, and data. Refer to the following Knowledge Base articles for advanced configuration:

Common SharePoint 2013 issues