I have just reviewed the contents of the Endura Mass and I can suggest you two options:
1) You can change the times of meals to 3 times a day and bulkup the amount each time with regular exercise (small amounts with many meals will not help you gain weight easily).
2) You can also use that Endura mass. Take 2-3 teaspoons in the morning time or noon time once a day along with your OWN meal timings, avoid at night. But be cautious as high protein intake can cause proteinuria
which can damage your kidney
I gave you the first option because you don't have to worry about the Proteinuria.
Be healthy, Thanks.