1. Read and translate within the original web page.
2. Import the article to read on Readlang.
Either way, you need to install the Web Reader & Importer.
Chrome Extension (Desktop only)
Install this extension: https://chrome.google.com/webstore/detail/readlang-web-reader-impor/odpdkefpnfejbfnmdilmfhephfffmfoh
This will place a green "R" button next to the address bar, click it when on the webpage you want to visit.
Learn how to install and use the Chrome extension in this video:
Bookmarklet (Firefox and other browsers)
This works exactly like the Chrome Extension, except that instead of a green "R" button, it becomes a link in your bookmarks bar.
Readlang Web Reader (drag this link into your bookmarks bar to install, or in Firefox right click and select "Bookmark This Link")
For instructions on installing and using the Web Reader in Firefox, see this video: (the method for other browsers should be similar)