Printrbot Simple + OctoPrint on PC not working
Before any axis can move the printer must be homed correctly (G28 command, or an equivalent home button, there are 2: an X/Y and a Z button). A correct printer profile must also be defined; this profile contains some bed geometry and speed data, these are some basic values that are easy to add through the wrench button and "printer profiles" menu item.

Note that Cura 15.04 is very old, more recent version with far more options and better stability can be downloaded, but won't work integrated in OctoPrint, instead you download the most recent version of Ultimaker Cura directly from Ultimaker.com slice your product and store the G-code file to later import this into OctoPrint.

Please take care in choosing an optimal power plan in Windows 10, if your computer goes to sleep during a print (or updates or crashes) your print is lost; using a Raspberry Pi is far more safe.