Hey @Alisyaputrihendarini, welcome to the HubSpot Community! 
Thanks for sharing the screenshot and for reaching out!
If you recently attempted the exam or exited it before finishing, a 12-hour wait is required before you can retake it. Here is the article about it: Academy certifications | Frequently Asked Questions
If it’s already been more than 12 hours, please try again in an incognito/private window or a different browser.
If it still doesn’t start, please share the certification name (internally I can see “HubSpot Sales Hub Software [FR]” let me know if that’s the one), confirm when your last attempt was, and we’ll look into it.
Thanks and have a wonderful weekend!
Bérangère