I2C LCD Serial Interface Board not displaying text (wrong pins?)
First of all, it looks like these wires aren't properly connected:


  


I haven't disassembled a female jumper before, so that might not be the issue. However, it seems likely that this could be a cause.

Also, you need to adjust the contrast by turning that trimmer (the blue thing that looks kinda like it has a screw in it). LCDs will either display nothing, a washed out version of the text, or blue boxes if the contrast is not set correctly. This is probably the cause.