Okay, so I didn’t speak about your second question, because probably the first one causes the rating error.
The article, which is in that link that you are sent to me in your last reply is about file permissions. File permissions defines if your server can access to your source files of wordpress or not, so it should be configured correctly for server to manage those files.
So, I suggest you to check your file permissions in wp-config file and in your system, then make sure about the server has right permissions to manage those files.
If you are not familiar with it, please ask your technical partner to do these modifications
OR
you can try out our admin system as well, which is separated to your wordpress site, it is in cloud, you could have more options to edit widgets, etc. Please check it on https://admin.trustindex.io site, create a trial account, then decide if it is good for you. Note that, you will get only 7 days trial, so after that, you must pay if you want it to use further.
I hope that I could help you,
Adam
Trustindex