@Anton+Bar , It's simple.
Copy page.tpl.php from "/profiles/apigee/themes/apigee_responsive/templates/pages/page.tpl.php" to "/sites/all/themes/freightos_responsive/templates" folder.
Edit lines 108, 109 to add css classes,
l(t('Register'), 'user/register');
->>>>>>>
l(t('Register'), 'user/register', array('attributes' => array('class' => 'btn')));
l(t('Login'), 'user/login');
->>>>>>>
l(t('Login'), 'user/login', array('attributes' => array('class' => 'btn')));
Push the code & Clear Drupal caches as Developer Portal administrator using admin menu home icon -> Flush All caches link.
Hope it helps.
Strong Suggestion : I suggest to hire a Drupal Expert / Consultant to do above simple changes. It will be cake walk for someone who knows Drupal.
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