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It's not related to steem power when you can't upload, just try other browsers or incognito mode. If you can't comment just power up a few days and everything will be ok. Click on steem you have and then power up, or steem dollar click on market and convert it to steem and power up again.

I think it’s related to the amount of SP he has.

Users need to have certain amount of RC to post.

So he needs to invest his time (or money) to build up his SP and RC

Yeah, powering up is important.

The other thing you need to check is your Resource Credits here https://steemd.com/@lovelens , they are really low, to let them grow you have to stop commenting and upvoting for a while. I have an app called @steem-plus installed on my pc, it show how long you need to wait. In this case it's saying 4 days. But when you power up, you shouldn't wait but just post and comment. But with low power you should save your Resource Credits anyway. So, you have two choice, choose one of them. ☺

@clixmoney I'm so sorry for replying t late, I have problem with my account

It's not a problem , just like nathanmars said, you need to power up a bit. All new users face this. After the updates we had, now users can't write a lot if they don't have enough steem power. Just learn about that. Try to make #dtubesnap videos and maybe @nathanmars will delegate to you so you will be able to interact. I'm telling you, if you don't want to invest steem, just convert steem dollar that you have in your wallet to steem and power up with that. Or buy some steem to start with.

Or participate in contests and giveaways, so someone will delegate to you some power.