Williams Bible Links™ requires a starting verse. But how do you identify that first lookup verse?
One method is by topic. For instance, if you are interested in the topic of prayer then you can do a web search on "bible prayer". That will give you articles with verses about prayer, which you can then use as lookup verses.
A second method is by a remembered Bible quote. What if you want to find the verse which says, "The Lord is my shephard, I shall not want"? Again, do a web search on whatever parts of the verse you remember. The verse reference will be listed in the search results for your use as the lookup verse.