You must add these settings before you create any tasks. Any settings that are changed after a task has been created won't take effect until the task is remade.
Webhooks
The Discord Webhook URL has to be added into 'Settings' tab > 'Webhooks' tab > 'Discord Webhook URL' field.
Captcha Solver
The Captcha API Key has to be added into 'Settings' tab > 'General Settings' tab > 'Capsolver.com API Key' field.