I would like to get rid of Babble.com YouTube and Twitter apps from my computer

Question edited for clarity.

There is a rather 'round about' way of doing it and it starts with your computer!

Installing Apps using APK Installer on my Sinotec TV Home screen

• Open your browser on your computer, find the APK file you want to download, and select it.
• Once the App is downloaded, open Downloads, right-click on the APK file, then save to USB or external storage device.
• To install this APK from your storage device to the TV, plug the USB into the TV.
• On your HOME screen, go to APK installer, and select the APP you would like to install
• The app will begin installing on your device.
• After the application has successfully been installed the user can run the app with no issues.
• Please Note: Only selected smart models have the "Install APK" function.

https://www.sinotec.co.za/support/faqs/

Specs for your television says it comes with

• Netflix
• YouTube
• Twitter
• Facebook
• Mirashare
• Digital Dvb-T2
• Child Lock

Sinotec 58" UHD Android TV

Sinotec https://www.sinotec.co.za > product > sinotec-58-uhd-...
Open Browser: Yes; Prime Video: Yes; Netflix: Yes; DSTV Now: Yes; Showmax: Yes ... STL-58G50UM. Sinotec 58? UHD NETFLIX LED TV. Resolution: 3840 x 2160. View ...

..

That's it, follow of what the app required.

You must be always in contact with the support

jaideepinfo is a popular how-to blog that covers computer, mobile, Social Media, facebook, Google, Twitter, MySpace and YouTube,
http://www.jaideepinfo.blogspot.com

Setting up a twitter account is as easy as visiting www.twitter.com and filling out the form on the homepage.

Twitter also has a very detailed explination on how to sign up in the help section. You can read all about on their How to Sign Up on Twitter page.

403 Errors are usually caused by a script is trying to use a function that has been restricted by the server owner. I don't Twitter on my phone so I've not seen the error but it is likely a problem with your Twitter app or the Twitter website. I suggest contacting Twitter.