Reading the statistics
Loads, views, clicks and CTR – for the blocks on your site and for your content on other sites.
The exchange is measured from two sides, and the dashboard has a page for each.
Statistics → Clients is about your own site: how the blocks you placed performed in front of your visitors. Statistics → Content is the other direction: how the content you offered performed on other members' sites.
The four figures
Both pages show the same set: Loads – how many times a block was loaded, Views – how many times it was actually seen, Clicks – how many times a visitor followed it, and CTR – clicks as a share of views.
Each figure sits in its own tile with a checkbox that adds or removes the matching line from the chart below, which is handy when one metric dwarfs the rest.
Filters
Period switches between Today, Last week, Last month and Last Year. Client narrows everything down to one of your sites, or keeps All of them together.
In the WordPress plugin
The plugin carries a short version of the same thing on its Statistics page: two seven-day charts with no filters, and a More details link under each that opens the matching page here – see Main and Statistics in the plugin.