Question

How to block someone?....

Answer 1

You can check the setting of that software for the blocking option. How ever the option is located differently in mobiles application and computer softwares. so read the reviews for particular app. 

Answer 2

Explanation:

Select Settings & Privacy > Settings. Click Blocking in the left side menu. In the Block users section, enter the name of the person you want to block and click Block. Select the specific person you want to block from the list that appears and click Block > Block [name].