Add columns

Sorry not sure what you mean by below the post? Like in the footer area?

Thank you for your answer.
I followed your advice and installed Lightweight Grid Columns.
I went into my page, add 2 columns in visual editor, this code appear :

[lgc_column grid="50" tablet_grid="50" mobile_grid="100" last="true"][/lgc_column]

but I don't see columns and I don't know where add my pictures and how ? (by code or Media editor ?)
You'll can see my low level :-)

Just for information, "Below" is for me "below the page", I would like my icons below the page, in the center.
I'm waiting for your advise concerning where and how to put my pictures after Lightweight Grid Columns installation.
Thank you very much !

I think it was a mistake to employ "below" certainly I would have to say "at the bottom" of my page (and not my post). Congratulation to understand me and to help me :-)

You're doing fine :)

Try using the Footer Widget or Footer Bar in Appearance > Widgets.

You can drag and drop the desired widgets into the available area.

Thank you, it would be a good idea, I've ever thought to be honest with you, but If I understand the structure of generatepress, I'll find the footer Widgets or Footer bar in all pages of my web site, and I don't want.
I just want to put 2 icons in my home page.
It's the reason why I thought to use columns but I don't understand how to use Lightweight Grid Columns, and put my icons in two columns...
To begin I was tired to have to do many things for a simple action, now I begin to like it, may be because I begin to feel not alone to resolve problems.
Thank you sir, I'm sure we will finish to find not a solution, but "The" solution, the best :-)

Ah ok then try using GP Hooks:
https://docs.generatepress.com/article/hooks-overview/

See where they are located here:
http://demo.generatepress.com/hook-locations/

Then use this so it only shows up on your front page:

<?php if ( is_front_page() ) : ?>
    Contents for home page here
<?php endif; ?>

Hi,
Thank you for your help.
I do agree, hooks are a solution. To finish this post, could you help me please to use Lightweight Grid Columns to add columns ? I've a code to create 2 columns but what can I do after ? Are you sure is-it ok with GP Premium ? Thank you very much

You can create the code using the Visual Editor of WordPress, then switch to Text Editor to copy the code.

You would add content in between the lightweight grid column shortcode.

Thank you for your answer.
I want to write test1 in a 1st column, and test2 in a second column on the right.
The code is like this "[...]x[...]y"
I tried to replace x and y by test1 and test2 but the result is : test1 and below test2, not on the right.
Where is my mistake ?
Thank you

Head to this page: https://en-ca.wordpress.org/plugins/lightweight-grid-columns/

Scroll down to FAQ section and see "What if I don't want to use the TinyMCE button?" for an example.

I forgot something, now it's ok !
Thank you very much and have a good day !

No problem! You as well.