You cannot render to some format, the option is greyed out in the rendering dialog:
A greyed out profile means the video or audio codec is not installed on your computer. Kdenlive uses FFmpeg for all video rendering, so you must enable these codecs in FFmpeg.
After installing those missing libraries, you must run the "Config Wizard"  that can be started from Kdenlive's Settings menu. Then restart Kdenlive and the rendering profile should be available now .