For BYOD computers and mobile, click on this link to download and install the Securly Certificate:
https://support.securly.com/hc/en-us/articles/220803847-Securly-CA-Certificate-All-Formats
For Iphone, make sure Securely is fully trusted by going to Settings, General, About, Certificate Trust Settings, and make sure *.securly.com is checked green.
For more detailed instructions for iOS, click the link bellow.
For BYOD Mac Laptops, click on the following link and follow the instructions for "Manual installation process".