Avidmux 2.6 how to save video

[MikeH]

I've got 4 videos of my grandson recorded in portrait format by my wife on her phone, and 1 steam train video recorded in portrait format on my camera......Doh! I obtained a program called Avidmux 2.6 as this has the capability of turning the video thru 90°/180°/270°. Opening one of the videos and making the setting selection of 270° and pressing the play button, the video is perfectly orientated. But......for the life of me I can't find how to save the modified video. Has anyone used this software and saved a video successfully? If so, could they please let me know how to do it?
Thank you,
Mike