Improving Performance [for Coding Dummies]

Greetings. My website is moving INCREDIBLY SLOW, and I have read several articles and posts about how to improve performance. Unfortunately for me, it’s all like reading a foreign language. I have NO idea what any of means, or how to determine what code I need to insert on which pages. I’m totally clueless and abundantly frustrated.
This is only one of several questions I’ve posted lately. None of my recent posts have yielded any answers, but I’ve managed to figure most of those things out by piecemealing answers to other people’s questions. I am PRAYING that SOMEONE, ANYONE can help me understand what I need to know in order to improve the performance of my client portal. Pleasssseee helllllppppp!!!

Could you give us the URL of your site and maybe your code?

My website address is: www.writeitrightsite.com. There’s tons of code on several pages within the portal area of the site. Would you like me to add you as a collaborator?