1/ Open wakaru, go to the help (button (i)) and then go to the web browser section.
2/ Copy the code in the frame
3/ Open safari and go to any page.
4/ Tap the action button
5/ Tap add bookmark and replace the page name by "Wakaru". Don't change the url at this point (it is not editable at this point)
6/ Open the bookmark manager
7/ Tap edit at the bottom of the page and edit "Wakaru" bookmark. In the url field, paste the piece of code copied in Wakaru previously.
8/ Go back to the main screen of the bookmark manager and tap done at the bottom
9/ Then, when you tap on "Wakaru" bookmark in Safari, the current page is opened in Wakaru.