registrars after registering

can i change registrars after registering i web hosting ?

Sure, It is called domain transfer. If you are going to move to more reliable registrar you should use Eurodns. You will get high quality affordable services.

Ofcourse you can but when you do transfer your domain to other. You need EPP code from your current web hosting provider.
Domain register usually would not refund. But when you register with next web hosting provider they will extend one more year when you transfer.

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I also support Eurodns services. You will be pleased by their affordable prices, attractive offers and nice promos. Get .co for 14 Euro with coupon code 14CO11.

Yes you can. But there are some time frames when that is allowed. Moreover transferring to new registrar you will need to renew domain name.
Only Eurodns.com do not charge for transfers

The link below will tell some instances that will restrict you from transferring domains
http://www.icann.org/en/transfers/policy-12jul04.htm