how to become a Sikh?

Respected Jennifer ji,
Waheguru ji ka Khalsa, Waheguru ji ki Fateh!

In reply to your question the undersigned wants to say that:-

1. “Sikh” is a “Seeker of Truth” and “Sikhism” stands for:-
(i) Oneness of Humanity;
(ii) No discrimination owing to gender, race, caste, creed, or color;
(iii) No empty rituals & worthless religious practices;
(iv) No life after death theories. Rather, it stands for salvation/emancipation, during the life time on getting rid of vices.

2. Further, Sikhism:-

(i) teaches a Sikh to live his life in the present, as per Hukam of Akalpurakh and teachings of ever living Guru, Sri Guru Granth Sahib;
(ii) expects a Sikh to earn an honest living, remain connected with Akalpurakh all the time and share his honest earning with poor and needy;
(iii) expects a Sikh to be compassionate, kind, tolerant and is to love all i e. he is to reach the mental state of seeing Akalpurakh in everyone and hence having friends only and no enemies;
(iv) expects a Sikh to serve the humanity, without any distinction of caste, creed and religion.

3. Guru Granth Sahib teaches a person/Sikh to become a righteous/virtuous person and become one with Akalpurakh/Shabad Guru, who are embodiment of each other.

The goal of becoming a righteous/virtuous person was laid down by the First Guru Person Guru Nanak Sahib, in the first Pauri of Jap Baani itself, when he said:-

Kiv Sachiara hoiey, Kiv Kude Tute Pal,
Hukam Rajai Chalna, Nanak likhya Naal.

ਕਿਵ ਸਚਿਆਰਾ ਹੋਈਐ ਕਿਵ ਕੂੜੈ ਤੁਟੈ ਪਾਲਿ ॥ ਹੁਕਮਿ ਰਜਾਈ ਚਲਣਾ ਨਾਨਕ ਲਿਖਿਆ ਨਾਲਿ ॥੧॥

4. Once a person/Sikh achieves the goal of becoming a righteous/virtuous person and becomes one with Akalpurakh/Guru, he will live a disciplined life and get rid of vices and achieve the stage of spiritual equipoise and spiritual bliss. The main goal is to achieve emancipation/salvation in this life itself since there is no concept of salvation/emancipation, after death in Sikhism.

5. The main difference between Sikhism and other religions is that Sikhism propagates salvation/emancipation, during the present life itself by getting rid of vices, while it is not so in case of other religions.

Hope it helps. If you have any further questions, please do ask. If you find any deficiencies, please point out the same, for improvement in future.

Regards,
Your Brother