Yes, you can easily change your SIP date and SIP amount by following these simple steps:

Go to mutual funds section and select SIPs.
Select the SIP you wish to change.
Click the 'Edit SIP' button, and choose 'edit date and amount'
After making changes click on 'Save Changes'.
Click on confirm.

The newly edited SIP will be deducted from your account from the next SIP payment date.

Note: If your next installment is within 2 working days, your edit SIP request (amount, date, or skipping an installment) will not apply to that installment and will only apply to the installments after that.