Author pages can be accessed by clicking the author link.
If you want to create a custom about page, simplest way will be to use left alignment on images with paragraph on right. Alternatively, you can use any column plugin to make good looking about page.
Install and see if any of them fits your need else uninstall and move to next.
Please note that we don’t provide any third party plugin support here, if you have extensive customization requirement you can hire a developer or use a site like wpquestions.com