PHP If Checkbox Checked, Then (WordPress)

Intro

I have some custom fields in my WordPress profile area. Here's an example of a checkbox in my code:

<input type="checkbox" name="A" id="A" value="yes" <?php if (esc_attr( get_the_author_meta( "A", $user->ID )) == "yes") echo "checked"; ?> /><label for="my_field "><?php _e("Order Button"); ?></label><br />

This field is A, and I'm saving it in the same file with:

update_usermeta( $user_id, 'A', $_POST['A'] );

This is working, and when the user clicks it on or off, it saves.

The Problem

However, I am having a big issue posting the results if the checkbox was checked.

In another file I have this:

if(isset($_POST['A'])) {
echo 'asd';
} else { }

I have tried a lot of variations, but I can not figure out how to get the If statement to check whether the user checked the box or not, it only echos the else.

TL;DR:

I can't figure out how to check if the usermeta is checked or not, and how to output that into another element of the website.

http://ift.tt/1CDwdBP Link to User Profile Code

http://ift.tt/1HbfWTK Link to Header area where I'm trying to call the checkbox.