I want switch my site from http to https and there are listened problems where should I found solution, in which files?

Mixed Content: The page at 'https://forum.tibiaservers.net/' was loaded over HTTPS, but requested an insecure stylesheet 'http://forum.tibiaservers.net/cache/css/cd4730b52e7b1839964b953e0bdd9651.css'. This request has been blocked; the content must be served over HTTPS.

Mixed Content: The page at 'https://forum.tibiaservers.net/' was loaded over HTTPS, but requested an insecure stylesheet 'http://forum.tibiaservers.net/sites/default/plugins/sso/assets/css/sso.css'. This request has been blocked; the content must be served over HTTPS.

Mixed Content: The page at 'https://forum.tibiaservers.net/' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://forum.tibiaservers.net/Ajax/cron/run?token=897dd37e63f6ab84fe2422cd02d1fd00'. This request has been blocked; the content must be served over HTTPS.send @ 172524270782439e3a1936b0d3645ed4.js:1
172524270782439e3a1936b0d3645ed4.js:1 


Mixed Content: The page at 'https://forum.tibiaservers.net/' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://forum.tibiaservers.net/template/forum/topics'. This request has been blocked; the content must be served over HTTPS.send @ 172524270782439e3a1936b0d3645ed4.js:1
172524270782439e3a1936b0d3645ed4.js:1 


Mixed Content: The page at 'https://forum.tibiaservers.net/' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://forum.tibiaservers.net/Ajax/data/new?firstTime=true&time=0&_token=897dd37e63f6ab84fe2422cd02d1fd00'. This request has been blocked; the content must be served over HTTPS.

Mixed Content: The page at 'https://forum.tibiaservers.net/' was loaded over HTTPS, but requested an insecure image 'http://forum.tibiaservers.net/sites/default/assets/img/cats/icons/567898c60c4bfuparrow118.png'. This content should also be served over HTTPS.

Mixed Content: The page at 'https://forum.tibiaservers.net/' was loaded over HTTPS, but requested an insecure image 'http://forum.tibiaservers.net/sites/default/assets/img/profiles/icons/M_19bf00.png'. This content should also be served over HTTPS.

Mixed Content: The page at 'https://forum.tibiaservers.net/' was loaded over HTTPS, but requested an insecure image 'http://forum.tibiaservers.net/sites/default/assets/img/profiles/icons/A_734939.png'. This content should also be served over HTTPS.