How To Add Widget To Sidebar

what theme?

can you post a link to your site?

yeah sorry I cant believe I forgot to put the link.. https://myadvertisingflags.com/

you can see the sidebar whan you go to a single post or a single product;

the layout of the front page without a sidebar seems to be a design feature;

where exactly do you want to show the sidebar?

On the right hand side of the website.. I want to put an email form or maybe an ad also..

it looks like you need to create a new sidebar for those product pages;

start by reviewing
https://codex.www.ads-software.com/Widgetizing_Themes

this is a major customisation of that theme, including html and css, and it might be beyond the possiblilities of this forum to guide you through all steps.

Makes sense.. Thanks for you help I really appreciate.. I might just have to hire a VA for this programming..