You have to have a boyfriend or girlfriend before you can propose.
You have to have boyfriends and girlfriends before you have someone to propose to. If not, find someone to date in love, and become a boyfriend and girlfriend relationship. As shown in the figure
After you have a boyfriend, in the main screen of the game, click on the relationship option first. The operation is shown in the figure
In the family relationship, you can see your boyfriend, click on the boyfriend. As shown in the figure
A long window will pop up, at the bottom is the proposal option, click Propose. As shown in the figure
Proposals will succeed, proposals will fail, and pop-up Windows will tell you the final result. As shown in the figure
If the proposal fails, you can find ways to improve the charm, such as plastic surgery, will improve the chance of marriage. As shown in the figure