In an optative way.

plural of optative

(grammar) A mood of verbs found in some languages (e.g. Sanskrit, Old Prussian, and Ancient Greek, but not English), used to express a wish. / (grammar) A verb or expression in the optative mood.

Expressing a wish or a choice. / (grammar) Related or pertaining to the optative mood.

present participle of opt in

Third-person singular simple present indicative form of opt in

simple past tense and past participle of opt in

To choose to participate in something

(intransitive) To choose; select.

The property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertising.