Journal 3 manages modules and layouts through its own Layout Builder rather than OpenCart's standard Design > Layout screen. Here's where the withdrawal button module fits in.
In the admin menu, go to Journal > Layouts (this is Journal's own page/layout
editor, separate from OpenCart's Design > Layouts). Pick the layout you want the
button on, for example Account for the customer account area, and click its edit
(pencil) icon to open the visual builder.
In the builder, pick the column you want (for example Column Right, where the Account Menu
already lives) and click its + to add a new row. Click into that row's
"Add module…" field to open the My Modules picker, scroll the category
list on the left all the way down to Opencart, and select it. Scroll the resulting
module list down to find Ninawebs EU Withdrawal — Button - Withdrawal Button and click it
to add it to the row.
Click Save in the top right of the builder. The button's own look (style, size,
colours, corner rounding) is configured separately from its module settings page under
Extensions > Extensions > Modules, the same as on any other OpenCart theme. Once
saved, the button shows up immediately wherever that layout is used, no extra cache clearing needed
for the layout change itself.
Separately from this layout-builder placement, the optional Journal 3 compatibility add-on patches Journal's account page template so the "Cancellations and withdrawal requests" account link can appear automatically with the source-verified Journal 3.1.14, 3.1.15, 3.2.8, and 3.2.10 account-page patterns. If you've customised your Journal account menu manually, you may need to add that link yourself; see the main documentation for the account page details. Want the button or a plain link in the site footer instead? See the Footer Builder placement guide.