Tap the Settings icon 
,
then Bible Link, then Edit.
To add a new link, tap the top row, to edit an existing link, tap that row.
Enter (or edit) the link name and URL, then tap
Done (or Cancel). In Edit mode you can also delete and
rearrange links; tap Done again to finish editing.
The details of the URL are entirely up to the web site or bible app, but every URL should contain the placeholder "%@" in the location where the bible verse reference appears. By default, ReadingPlan substitutes the text of the current reading into this location, with any spaces in the title replaced by a plus sign, '+'. Many bible apps and most web sites accept this format, but many do not. ReadingPlan 4.0 and later can perform much more involved substitutions; please contact support for assistance.