Cool Link Pie, I've saved that for future reference!
Soul,
Look to the left hand side of the page, under the string names, you can select either "Display note names" or "Display intervals" The numbers are intervals (the relationship between the pitch of the notes), not suggested fingering.
I wouldn't worry about them for now. Just switch it to "display notes"
To show the "blues" scale, just select "Pentatonic Blues" from the list.
If you are trying to learn scales from scratch though, I actually would not at all recommend trying to figure it out from that website.
I (and of course I'm just saying how I did it, everyone is different obviously) would learn the "patterns" for the scales first. There are a buzillion places you can go online to learn the patterns for Pentatonic and Pentatonic blues and they'll show you the best fingering for each pattern. Once you can play all the patterns, you can link them all together for screaming solo's
I can't really recommend the best site (cause I learn't them from a book) but I reckon there's a very, very good chance Robert has some lessons posted online somewhere, or failing that, google pentatonic scale patterns and check on youtube if you want a video lesson.
Hope that helps!