That depends on what you HAVE:
1) Using ZORK-edition: there is a point in PRS+ options and you simply can choose JUSTIFICATION there. It works in lots but no all ebooks.
2) Using NORMAL edition of PRS+: you have to change the CSS-file in the font package (or whatever CSS file you use). Change 'text-align: left' to 'text-align: justify; '. That should work in lots but no all ebooks.
Summing up written:
Responsible in any case is the/a CSS file. If justification doesn't work, you would have to alter this file(s) in appropriate manner (tons of information to be found here in this forum).
One reason for making my own version of PRS+ (ZORK) was to have a simpler solution to choose between sizes and justifications.
Ah, if you have an eReader past X50-line (T1, T2) forget all those... It will not work cause of a different operation system.
Last edited by Analogus; 09-01-2012 at 06:49 AM.