Hello Prince_1999,
This is something typically done only by system administrators. This article may offer some additional insight: Trust manually installed certificate profiles in iOS and iPadOS - Apple Support. It explains:
"You must manually turn on trust for SSL/TLS when you install a profile that is sent to you via email or downloaded from a website.
If you want to turn on SSL/TLS trust for that certificate, go to Settings > General > About > Certificate Trust Settings. Under "Enable full trust for root certificates," turn on trust for the certificate.

Apple recommends deploying certificates via Apple Configurator or Mobile Device Management (MDM). Certificate payloads are automatically trusted for SSL when installed with Configurator, MDM, or as part of an MDM enrollment profile."
We hope this helps. Let us know if we can assist with anything else at all. Take care.