[Solved] How to change the value of an element

Hi!

I would like to change the value for this element:

Now:

<div class="wpdiscuz-subscribe-form-button">
<input id="wpdiscuz_subscription_button" class="wpd-prim-button" type="submit" value="›" name="wpdiscuz_subscription_button">
</div>

New:

<div class="wpdiscuz-subscribe-form-button">
<input id="wpdiscuz_subscription_button" class="wpd-prim-button" type="submit" value="OK" name="wpdiscuz_subscription_button">
</div>

Please tell me which files need to be changed.

I don’t want to and can’t change using translation, since the current value is also used in other elements of the site.