Devise giving admin privileges to destroy

Just added an Admin model to Devise. I am on Rails 4.

I would like to give the Admin privileges to destroy and update articles that other users have created.

Having trouble finding documentation on how to do so.

Right now I have this on my index page, which allows the current creator to destroy/edit:

<% if current_user == article.user %>
  <p>
    <%= link_to 'Edit', edit_article_path(article) %>
    <%= link_to 'Destroy', article, method: :delete, data: { confirm: 'Are you sure?' } %>
  </p>
<%end%>

Would I add something here to let admins be able to do this as well?

Also here is my destroy action in articles_controller:

def destroy
  @article = current_user.articles.find(params[:id])
  @article.destroy
 respond_to do |format|
  format.html { redirect_to articles_url, notice: 'Article was successfully destroyed.' }
  format.json { head :no_content }
 end
end

I am still a Rails beginner. Tons to learn. If this is already documented somewhere could you please point me in that direction.

Here you go. Quite an extensive documentation:

https://github.com/plataformatec/devise/blob/master/README.md

Very first steps are to simply add

 before_action :authenticate_user!

to your controllers.

If you also need authorization have a look at cancan:

https://github.com/ryanb/cancan

Or rather https://github.com/elabs/pundit since CanCan is no longer maintained.