Hi there,
If you wanted to remove them, you can head to this path
../components/com_komento/themes/wireframe/form/default.php
and remove codes below then do template override for this files as follow
https://stackideas.com/docs/komento/administrators/customization/theme-overriding
[gist type="php"]
<div class="o-grid__cell t-text--right">
<?php if ($this->my->guest) { ?>
<?php echo JText::_('COM_KOMENT_POSTING_AS_GUEST');?>
<?php if ($allowRegistration) { ?>
<?php echo JText::sprintf('COM_KOMENT_LOGIN_LINK', KT::login()->getRegistrationLink(), KT::login()->getLoginLink());?>
<?php } ?>
<?php } else { ?>
<?php echo JText::sprintf('COM_KOMENT_POSTING_AS', $this->html('html.name', $this->my->id)); ?>
<?php } ?>
</div>
[/gist]
If you wanted to translate them, you can translate them on string listed below and see how it goes. There are two way for you to translate them, either you edit it main language file here
language/your_current_language/your_current_language.com_komento.ini or do language override as follows
https://stackideas.com/docs/komento/administrators/how-tos/how-to-create-language-string-override
COM_KOMENT_POSTING_AS_GUEST
Please give it a try and see how it goes.