Unable to update wordpress

I have created an ECS Instance in Alibaba Cloud using a Marketplace image powered by IGS(WordPress on Centos 7.4 64Bits). The installation went fine, but when I am updating, I am getting asked for FTP Details which I am not aware.

How can I find the details of FTP or create one? And what is it used for?

Please find below the link to the documentation of custom Image.
https://mp-intl-article.oss-ap-southeast-1.aliyuncs.com/commodity_user_guide/387d73fb-108d-438b-ac7c-c3b366c647cb.pdf?file=387d73fb-108d-438b-ac7c-c3b366c647cb.pdf

This is a permissions (solved by chmod) issue.

You don’t have enough privileges (755 at least) for WordPress to update. This also means you can’t write to wp-uploads and so on.

Check this out:

https://stackoverflow.com/questions/18352682/correct-file-permissions-for-wordpress