My reCaptcha is giving error although i used the right site key: https://prnt.sc/mtvjmj
I am on V2, still facing thing problem.
Then you've configured the key incorrect.
Make sure you don't have other reCATPCHA plugins, use the core wpForo reCAPTCHA in Forums > Tools > Antispam admin page.
Delete current configured key from google and create it again, then update those in wpForo settings. Delete all caches, logout, navigate to forum front-end and press Ctrl+F5.
It is showing now, but not showing on www.DigitalPhablet.com/Login and www.Digitalhablet.com/Register where it should.
As mentioned @martin above please disable all reCAPTCAH plugins, it seems you use UM reCAPTCHA addon or other plugins. You should only use wpForo reCAPTCHA if you use wpForo Reg/Login pages. wpForo reCAPTCHA located in Dashboard > Forums > Tools > Antispam tab. If not, you can use other reCAPTCHA solutions. Please read my post above.