cURL Failed. Help!!

Help. Trying to Install GRA4, and all I get is this when I click on the GRZ4 page

cURL failed. Please reload this page. If the problem persists – check your PHP settings.
Couldn’t resolve host ‘gate.gra4.com’
Current Maximum Upload Size is 96M
Current Maximum POST Size is 96M

website is http://www.ec911.org

https://ww.wp.xz.cn/plugins/gra4-social-network/