Problem when running RStudio on Mac

I cannot launch RStudio on Mac iOS Catalina 10.15. I receive the following message:

Hi @bistravassileva,
Welcome to the RStudio Community Forum.

You haven't given us much to go on. Looks like your Mac cannot find the directory where RStudio is installed. Have you checked where that is, and whether that directory appears in the $PATH?
https://apple.stackexchange.com/questions/358687/right-way-to-add-paths-to-path-in-mojave

HTH

Actually RStudio works and I am not sure should I change anything.

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Thanks for your reply.
I have passed through the installation again and I received this message:
During startup - Warning messages:
1: Setting LC_CTYPE failed, using "C"
2: Setting LC_COLLATE failed, using "C"
3: Setting LC_TIME failed, using "C"
4: Setting LC_MESSAGES failed, using "C"
5: Setting LC_MONETARY failed, using "C"
[R.app GUI 1.71 (7827) x86_64-apple-darwin17.0]

WARNING: You're using a non-UTF8 locale, therefore only ASCII characters will work.
Please read R for Mac OS X FAQ (see Help) section 9 and adjust your system preferences accordingly.

I couldn't find the information in Help section what exactly should I change.