I am having a really hard time with flashing a custom recovery. I am trying to flash the xionia clockwork cwma_12518.6 and after about 3 or 4 days of trying to figure it out I am almost there. I am however stuck at this one part. It says To flash: via adb shell or terminal type this from root # shell. Well I found out that that meas to type su in the cmd and I did once earlier but now when I try to do it it tells me su is not recognized as an internal or external command. What am I doing wrong? Also do I have to type adb push and su before every command I send?