explain like i'm five: help with easy apk tool.

[sjdjsjkskslk]

i mean it when i say like i'm five! this is my first time messing with apks ever, i've had the easy tool on my pc for less than an hour and i'm very confused. any help whatsoever would be deeply appreciated. full error log is "'java' is not recognized as an internal or external command, operable program or batch file."

 

[sjdjsjkskslk]

edit: i figured that out! the issue now is decompiling the file. i keep getting a "ZipException: error in opening zip file" error, so i thought maybe i needed to extract the apk first, but that ended up in "crc failed, unexpected end of archive." i have no idea what i'm doing wrong here.