You can check PageRank of a domain here: https://www.prchecker.info/check_page_rank.php

The only thing discontinued about PageRank is the Chrome feature, which is completely separate.

For WordPress and most websites, redirects are easy to create with a plugin so you don't need to mess with .htaccess

Also, we change URLs a lot and do not see declines in keyword rankings - we often see increases because we're redirecting to an SEO-optimized folder and page name when it was generic before.

What are you trying to do and why?

You need to create page redirects within your website, not with Google.

Are you trying to redirect a domain?

I recommend you go to Google Search Console > Links > Top Linking Sites > More to see if Google has indexed the domains from where these links are placed. If they are not, it's going to be hard for Moz to detect them and they won't help you with SEO until they do show up there.

I also recommend that you only target websites for links with a PageRank of 4/10 or higher. You can check their rank here: https://www.prchecker.info/check_page_rank.php

I recommend you go to Google Search Console > Links > Top Linking Sites > More to see if Google has indexed the domains from where these links are placed. If they are not, it's going to be hard for Moz to detect them and they won't help you with SEO until they do show up there.

I also recommend that you only target websites for links with a PageRank of 4/10 or higher. You can check their rank here: https://www.prchecker.info/check_page_rank.php