Three small horizontal lines stacked one on the other in the upper right of your browser is the entry point for information about the Google Chrome browser. Hovering over the lines displays "Customise and control Google Chrome." Click the symbol to open a menu with an "About Google Chrome" option. Click this to display your version number and give you the option to update your browser.
The Firefox logo, a brown-orange fox wrapped around a blue globe, is a favourite for many. However, the logo is not always visible in the spartan Firefox browser window. Clicking the three stacked horizontal lines (almost identical to the Google Chrome symbol) in the upper right of the window displays a menu of options. Click the "Help" function (a question mark symbol), then "About Firefox" to display version information.
Apple's Safari is visually the most distinctive of major browsers, with its red, yellow, green lights near the upper left corner, and the Apple logo on the Safari toolbar at the top of the screen. Click "Safari" on the toolbar, then "About Safari" for details on the browser version.
The lower-case blue "e" with a gold streak through it is the telltale logo for Internet Explorer. You'll see it on the left side of the address bar and each open tab. You'll also find it on your taskbar of open programs at the bottom of your Windows screen, unless you've re-positioned or disabled it. The "About Internet Explorer" item on the "Help" menu will display an information box with details of your browser version and update status.