How can I install grubby? When I write command “grubby” , the inscription appears: the command is not found. therefore script does not run
Welcome to the forum! 
There is no package by that name in the Manjaro repositories, nor in the AUR. What exactly is that command supposed to do?
If you refer to this GitHub - rhboot/grubby then follow their documentation, but please do not ask on Manjaro forum for a fix once you mess your system.
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If what you are seeking to run/install is indeed the script referenced by @bogdancovaciu, then I would strongly advise you not to use that in Manjaro.
Manjaro uses a customized GRUB configuration, and tools like that script can seriously mess up that configuration. Likewise for tools like grub-customizer.
Do not install or run any third-party software in Manjaro if you are new to GNU/Linux, or even if you come from the world of Ubuntu and similar distributions. That’s some good advice, right there.
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Thanks for the warning. You’re right, the bootloader is broken. But I needed grubby for one script. It is worked. And I restored the bootloader without any problems)
If everything ended up as you planed and the script served its purpose, then is great nevertheless 